Add anonymous posting tests and integrate automatic testing

[lalmulai]

Implements anonymous posting's automatic tests. Feature developed as part of the assigned task for issue #2.

Purpose:
The tests verify that the anonymous posting feature functions correctly without interfering with other forum functionality. They ensure that:

• Users can submit posts anonymously.
• Anonymous posts are displayed properly in threads.
• The anonymity flag is correctly stored in the database.
• Non-anonymous posts remain unchanged.

Test File:
test/anonymous-button.test.js contains the automated test cases.

[coveralls]

Pull Request Test Coverage Report for Build 18430782062

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 7 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-4.5%) to 65.254%

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Files with Coverage Reduction	New Missed Lines	%
nodebb-plugin-thread-summarizer/library.js	7	65.25%

Totals
Change from base Build 18428430183:	-4.5%
Covered Lines:	54
Relevant Lines:	71

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💛 - Coveralls